| 1 | //===-- Utility class to test different flavors of fma --------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #ifndef LLVM_LIBC_TEST_SRC_MATH_FMATEST_H |
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| 10 | #define LLVM_LIBC_TEST_SRC_MATH_FMATEST_H |
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| 11 | |
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| 12 | #include "src/__support/FPUtil/FPBits.h" |
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| 13 | #include "test/UnitTest/FEnvSafeTest.h" |
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| 14 | #include "test/UnitTest/FPMatcher.h" |
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| 15 | #include "test/UnitTest/Test.h" |
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| 16 | |
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| 17 | template <typename T> |
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| 18 | class FmaTestTemplate : public LIBC_NAMESPACE::testing::FEnvSafeTest { |
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| 19 | private: |
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| 20 | using Func = T (*)(T, T, T); |
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| 21 | using FPBits = LIBC_NAMESPACE::fputil::FPBits<T>; |
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| 22 | using StorageType = typename FPBits::StorageType; |
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| 23 | |
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| 24 | const T inf = FPBits::inf(Sign::POS).get_val(); |
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| 25 | const T neg_inf = FPBits::inf(Sign::NEG).get_val(); |
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| 26 | const T zero = FPBits::zero(Sign::POS).get_val(); |
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| 27 | const T neg_zero = FPBits::zero(Sign::NEG).get_val(); |
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| 28 | const T nan = FPBits::quiet_nan().get_val(); |
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| 29 | |
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| 30 | public: |
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| 31 | void test_special_numbers(Func func) { |
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| 32 | EXPECT_FP_EQ(func(zero, zero, zero), zero); |
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| 33 | EXPECT_FP_EQ(func(zero, neg_zero, neg_zero), neg_zero); |
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| 34 | EXPECT_FP_EQ(func(inf, inf, zero), inf); |
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| 35 | EXPECT_FP_EQ(func(neg_inf, inf, neg_inf), neg_inf); |
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| 36 | EXPECT_FP_EQ(func(inf, zero, zero), nan); |
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| 37 | EXPECT_FP_EQ(func(inf, neg_inf, inf), nan); |
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| 38 | EXPECT_FP_EQ(func(nan, zero, inf), nan); |
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| 39 | EXPECT_FP_EQ(func(inf, neg_inf, nan), nan); |
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| 40 | |
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| 41 | // Test underflow rounding up. |
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| 42 | EXPECT_FP_EQ(func(T(0.5), FPBits::min_subnormal().get_val(), |
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| 43 | FPBits::min_subnormal().get_val()), |
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| 44 | FPBits(StorageType(2)).get_val()); |
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| 45 | // Test underflow rounding down. |
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| 46 | StorageType MIN_NORMAL = FPBits::min_normal().uintval(); |
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| 47 | T v = FPBits(MIN_NORMAL + StorageType(1)).get_val(); |
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| 48 | EXPECT_FP_EQ( |
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| 49 | func(T(1) / T(MIN_NORMAL << 1), v, FPBits::min_normal().get_val()), v); |
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| 50 | // Test overflow. |
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| 51 | T z = FPBits::max_normal().get_val(); |
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| 52 | EXPECT_FP_EQ(func(T(1.75), z, -z), T(0.75) * z); |
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| 53 | // Exact cancellation. |
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| 54 | EXPECT_FP_EQ(func(T(3.0), T(5.0), -T(15.0)), T(0.0)); |
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| 55 | EXPECT_FP_EQ(func(T(-3.0), T(5.0), T(15.0)), T(0.0)); |
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| 56 | } |
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| 57 | }; |
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| 58 | |
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| 59 | #endif // LLVM_LIBC_TEST_SRC_MATH_FMATEST_H |
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| 60 | |
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